The finding that mutations in synapse genes are associated with many genetic disorders that have a behavioral component suggests that _____
a. individuals with these mutations lack synapses
b. individuals with these mutations lack neurotransmitters
c. malfunctions in presynaptic neurons cause abnormal behavior
d. malfunctioning synapses are associated with abnormal behavior
e. behavior disorders are attributable to environmental factors
d
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Consider the HIV enzyme called protease. The amino acid residues at the active site are highly hydrophobic. In designing a drug that would bind to the active site and jam it, researchers should use a molecule that is _____
A) hydrophobic B) polar C) charged D) acidic
A site of negative genetic regulation where binding by repressor blocks transcription is the
A. operon. B. repressor. C. promoter. D. operator. E. CAP.
The structure labeled "A" is the
a. aorta. b. inferior vena cava. c. pulmonary artery. d. pulmonary vein. e. superior vena cava
Cardiac muscle cells are ____
a. involuntary b. spindle-shaped c. multinucleated d. slow contracting e. found in the walls of blood cells